Hypodermic needle



' 29 v 19,24 J. E. WEBB HYPDDERMIC NEEDLE Fired April 14, 192#l Vfrom the tissue.

Patented July 29, 1924.

JHN E. WEBB, on itcGnEGoE, 'Iowa lrrYronEiaMIo NEEDLE.

Appiieaaqn filed Aprn 14, 1922. Serin No. 552,494.`

To all whom, t may 00a-cera:

Be it known that I, JOHN EVERETT WEBB, a citizen ofthe United States, residing at McGregor, in the county of Clayton and yState ofV Iowa, havefinvented certain new.

and useful Improvements inl I-Iypodermic Needles and I do kdeclare the following to be a full, clear, and exact description kof the invention,`such as will enable others skilled in the art to which it appertains to make and use the same.

rIhis invention relates to hypodermic syringes and has special reference to an improved type of needle, needle carrier and guard.

One object of the invention is to so con struct the needle and guard that when the syringe is in use, and the needle breaks from the carrier, its outward movement through the forward end of the guard will be limited and thus the broken needle caused to be withdrawn from the tissue and thus prevented tromv being left inthe tissue when. the syringe is withdrawn. kIt often happensY that in injecting cocaine (and other fluids with a hypodermlc needle, the needle will break and will remain 1n the tissue in which it has been inserted; but with the improvedL construction disclosed, this will be prevent ed as the outward movement of the needle through ythe guard will be prevented and therefore-the needle caused to be withdrawn It should be noted that a needle is always soldered to the Vcarrier which nts upon the neck at the forward end of the barrel and since this is the weakest point, Abreakage voccurs at this connection instead of intermediate the length of the' needle when bone or otherobstructions areencountered. Y

Another object of the invention is to so construct the carrier for the needle that it may be straight throughout its length or provided with a bend so that the needle, which will be straight, may entend lat a de* sired angle to the vbarrel or' the syringe and thus permit of insertion where insertion of Va needle extending longitudinally of the barrel would be diliicult.

This invention is illustrated in the accompanying drawings, wherein:

Figure l isa view showing thesyringe partially in elevation and partially in section.

Figure 2 is an enlargedview of the portion shown in section in Fig. l.

. Figure 3 is an enlarged sectional View of the needle.

Figure 4 is a sectional view showing a modified form of needle carrier..

.Figure 5 is a view similar to Fig. 4 showing another modification of the needle carrier.

This improved needle, needle carrier, and guard will be usedin connection with a conf ventional structure of hypodermicv syringe having the usual barrel B provided with the usual outlet neck N 'and having. a conventional structure of plunger P so that cocaineV or other fluid may betorced from the barrel through the outlet passage of the neck N. The needle l which is of the usual hollow construction so that luid may pass through the needle has its rear end portion secured against the outer end of the needle carrier or hub 3 by solder as sho-wn at 4 in Fig. 2 so that the needle will be normally held in engagement with this carrier but may break off at this connection when the point of the needle strikes bone or other obstruction and thus prevents the needle from being broken intermediate itsY length.. This carrier 8 is provided with a socket portion 5 which llits upon the neck N of the barrel B and therefore this carrier will be removably held upon the neck of the barrel. This neck may be simply slipped into the socket 5 or if desired the neck and socket may be provided with threads so that the neck will be screwed into the socket and thus firmly held in place but permit of easy removal when desired.

In Fig. I, the needle carrier is shown rela tively short and straight throughout its length so that the needle will extend longitudinally of the barrel as shown in Fig. l. In' Fig. 4, this carrier which is indicated bythe numeral 3 is elongated so thatv the head portion which is indicated in general byrv the numeral 6 is positioned relatively far away romthe socket portion indicated by the numeral 5 in this ligure'. Adjacent the head '6, the carrieris bent softh'at it extends?. toL onefside as shown thus causing the needle l to extend out of alinement with the body portion of the carrier and barrel. This form will be used for applying cocaine or other drugswhere easy access could not be had to the V'portion which it is desired to deaden if the form shown in Fig. l were used. In the form shown in Fig.v 5, the carrier whichy is indicated by the numeral llO Y 3 is only slightly longer than the form shown in Fig. l and intermediate its length is bent so that the needle extends out of alinement with the barrel but not to such an extent as it does in F ig. 4L.

The guard 7 fits upon the carrier and has its rear end abutting against the shoulder S of the carrier, this guard being simply slipped upon the carrier until it engages the shoulder 8 or having threads to engage co-operating threads of the carrier. rlhe guard extends longitudinally beyond the forward end of the carrier and has its forward end portion tapered so that it will engage the needle and provide guard means which will serve to brace the needle but still permit the needle to have movement independent of the guard so that if the needle breaks, it will break off at the soldered joint 4L instead of intermediate its length.

When the needle breaks, it is desired to prevent it from being left in the tissue and therefore the needle has been provided with a shoulder 9 formed as an enlargement which extends about the needle. This abutment shoulder is positioned intermediate the outer end of the guard and the inner end of the needle and therefore will be positioned within the guard. From an inspection of Fig. 2, it will be readily seen that when the needle breaks off from the carrier 3 this abutment shoulder will prevent the needle from passing entirely through the forward end of the guard. Therefore, when the hypodermic syringe is moved .to withdraw the needle, the abutment shoulder will prevent the needle. from passing entirely through the forward end of the guard and as the syringe is drawn rearwardly, the needle will be drawn out of the tissue.

I claim:

l. In a structure of the character described, a needle carrier, a needle fitting against and readily brealrable from the end of said carrier, and abutment means carried by the needle adjacent its end.

2. In a structure of the character described a needle carrier, a needle soldered to the end of the carrier for causing breaking of the needle from the carrier prior to breaking of the needle intermediate its length when the needle is subjected to transverse strain, and abutment means carried by the needle adjacent its rear end.

3. In a structure of the character described, a needle carrier, a needle carried by said carrier and breakable therefrom, a

guard carried by the carrier and fitting about the rear end portion of the needle, and means within the guard for limiting outward movement of the needle through the forward end of the guard when broken from the carrier.

4. rlhe structure of claim 3 having the guard in the form of a sleeve having its forward end portion contracted to provide a reduced needle passage, the portion of the needle between the needle carrier and reduced forward end of the guard being pro vided with an abutment limiting outward movement of the needle through the contracted forward end of the guard.

5. The structure of claim 3 having the guard in. the form of a sleeve having its forward end portion contracted to provide a reducedneedle passage, and an enlargement upon the portion of the needle between the needle carrier and the forward end of the guard to limit outward movement of the needle through the forward end of the guard.

6. A structure of the character described, a needle carrier adapted for connection with a syringe barrel and having a fluid passage, a hollow needle connected with the carrier and having its fluid passage registering with the passage of the carrier, a guard carried by said carrier and extending about the rear end portion of the needle, and means be` tween the rear end of the needle and forward end of the guard for limiting outward movement of the needle through the forward end of the guard when the needle becomes detached from the carrier.

7. In a structure of the character de scribed a needle carrier having its rear end provided with a socket for receiving the neck portion of a barrel and having its forward portion provided with an abutment shoulder, a needle secured against the forward end of the carrier, a guard sleeve litting upon the forward end portion of said carrier and abutting against the shoulder thereof and having its forward end portion entendingbeyond the forward end of the carrier and tapered to fit closely about the needle, and an abutment element carried by the needle intermediate the rear end there of and forward end of said guard to limit outward movement of the needle through the guard.

In testimony whereof I have hereunto set my hand.

` JOHN E. WEBB. 

